Roadmap #13 Batch A - UI overlap & chrome polish

[AlexZ005]

Roadmap #13 — Batch A: UI overlap & chrome polish

First batch of roadmap #13 (plan in docs/plan/roadmap-13-rooms-graphs-polish.md, uncommitted). Desktop chrome fixes from the user's notes drop.

Phase	Change
A1	AI prompt-pill: removed the ✕ (backquote/Escape still close) and lifted it above the Controls bottom stack so it no longer overlaps the main play button.
A2	New AI HUD button (white, sparkles) at bottom-left below the "+" (moved "+" up). Opens the AI chat window; hidden until AI is enabled and a provider is configured.
A3	SimControls is now opt-in via a Settings ▸ Scene toggle (default OFF — it confused with the main play button). Moved above the mic button so it no longer sits hidden behind it (the "not shown when wide" report). P still starts/stops the sim and hints at the setting on first hidden use.
A4	On narrow screens the right Inspector drawer starts below the top-right chrome, so the profile/peers buttons never cover its header.
A5	Settings rows stack the label above the description on narrow screens (was a fixed w-40 label crammed beside the description).
A6	Opening the logo menu dismisses any open modal, so the menu is never stacked over — and blocking — a modal.
A7	First-run warning on local/self-hosted builds nudges configuring a peer server, deep-linking to Settings ▸ Connection.

Also: the Settings deep-link mechanism (settingsSection) now covers the Scene and Connection sections.

Verification

• npm run build green.
• npx svelte-check held at the 501/77 baseline (zero new errors/warnings).
• New e2e suite tests/e2e/roadmap-13-ui-polish.test.cjs — 9 checks, all pass (SimControls default-hidden + toggle, logo-closes-modal, AI button gating + opens window, pill has no ✕).
• A4/A5 (narrow-width CSS) and A7 (hostname + localStorage gated, off on the .app domain) are verified by build + manual/logic; not asserted in e2e.

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